file drop support

- Add a folder where you can drop Zip files which will then be
  extracted on the fly and ingsted.
- CsvReaderSettings now contain TagMatcher that are applied to the
  first line and can be used to extract additional tags.
- Update to jdk 16 so that we can have records.

pdb-ui/src/main/java/org/lucares/pdbui/FileDropConfigProvider.java

@@ -0,0 +1,73 @@
+package org.lucares.pdbui;
+
+import java.io.IOException;
+import java.nio.file.Files;
+import java.nio.file.Path;
+import java.util.Map;
+import java.util.Optional;
+import java.util.regex.Matcher;
+import java.util.regex.Pattern;
+
+import org.lucares.pdbui.domain.FileDropConfig;
+import org.lucares.pdbui.domain.FileDropSettings;
+import org.slf4j.Logger;
+import org.slf4j.LoggerFactory;
+import org.springframework.beans.factory.annotation.Value;
+import org.springframework.stereotype.Component;
+import org.springframework.util.AntPathMatcher;
+
+import com.fasterxml.jackson.core.JsonParseException;
+import com.fasterxml.jackson.databind.JsonMappingException;
+import com.fasterxml.jackson.databind.ObjectMapper;
+
+@Component
+public class FileDropConfigProvider {
+    private static final Logger LOGGER = LoggerFactory.getLogger(FileDropConfigProvider.class);
+
+    private final FileDropConfig config;
+
+    public FileDropConfigProvider(@Value("${path.fileDropConfig}") final String fileDropConfig)
+            throws JsonParseException, JsonMappingException, IOException {
+        final Path configPath = Path.of(fileDropConfig);
+
+        if (Files.exists(configPath)) {
+
+            final ObjectMapper objectMapper = new ObjectMapper();
+            config = objectMapper.readValue(configPath.toFile(), FileDropConfig.class);
+            LOGGER.info("File drop config: {}", objectMapper.writeValueAsString(config));
+        } else {
+            config = new FileDropConfig();
+        }
+    }
+
+    public FileDropConfig getConfig() {
+        return config;
+    }
+
+    public Optional<CsvReaderSettings> provideCsvReaderSettings(final String file) {
+        for (final FileDropSettings settings : config.getSettings()) {
+            final AntPathMatcher antPathMatcher = new AntPathMatcher();
+            if (antPathMatcher.match(settings.match(), file)) {
+
+                final Map<String, String> variables = antPathMatcher.extractUriTemplateVariables(settings.match(),
+                        file);
+
+                System.out.println("match found " + file + " regex: " + settings.match() + " " + variables);
+                final CsvReaderSettings csvSettings = settings.csvSettings();
+                csvSettings.putAdditionalTag(variables);
+                return Optional.of(csvSettings);
+            }
+        }
+        return Optional.empty();
+    }
+
+    public static void main(final String[] args) {
+        final Matcher matcher = Pattern.compile("(?<source>.+)/(?<pod>.+)/(?<host>[^/]+)/performance.*.csv")
+                .matcher("web/vapsales01/0f5230761bb8a260e/performance.2020-10-05_000200_2.csv");
+        if (matcher.find()) {
+            System.out.println("match found");
+        } else {
+            System.out.println("not found");
+        }
+    }
+}